Photo by Melody

PlantFiles: Blackjack Oak
Quercus marilandica

Family: Fagaceae (fag-AY-see-ee) (Info)
Genus: Quercus (KWER-kus) (Info)
Species: marilandica (mar-i-LAND-ih-ka) (Info)

3 vendors have this plant for sale.

4 members have or want this plant for trade.


20-30 ft. (6-9 m)
30-40 ft. (9-12 m)
over 40 ft. (12 m)

30-40 ft. (9-12 m)
over 40 ft. (12 m)

USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Full Sun

Parts of plant are poisonous if ingested

Bloom Color:

Bloom Time:
Mid Spring

Grown for foliage

Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
4.6 to 5.0 (highly acidic)
5.1 to 5.5 (strongly acidic)

Patent Information:

Propagation Methods:
From seed; direct sow outdoors in fall

Seed Collecting:
Unknown - Tell us

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to view:

By Jeff_Beck
Thumbnail #1 of Quercus marilandica by Jeff_Beck

By Jeff_Beck
Thumbnail #2 of Quercus marilandica by Jeff_Beck

By Jeff_Beck
Thumbnail #3 of Quercus marilandica by Jeff_Beck

By melody
Thumbnail #4 of Quercus marilandica by melody

By melody
Thumbnail #5 of Quercus marilandica by melody

By melody
Thumbnail #6 of Quercus marilandica by melody

By melody
Thumbnail #7 of Quercus marilandica by melody

There are a total of 12 photos.
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2 positives
3 neutrals
No negatives

Gardeners' Notes:

Neutral JefferyDollars On Apr 28, 2010, JefferyDollars from Lawnside, NJ wrote:

I highly doubt blackjack oak is hardy to zone 3, its pretty much a zone 6 oak.

Neutral QueenB On Nov 27, 2006, QueenB from Shepherd, TX (Zone 8b) wrote:

Often found here in East Texas growing with Southern Red Oaks and Post Oaks. The leaves do resemble Water Oaks to a degree, but are larger and wider, and the bark is nearly black on mature trees. It's not unusual to find some really big leaves up to 8" long on saplings. Acorns are medium sized, barrel shaped, with striping.

Positive escambiaguy On Jul 17, 2005, escambiaguy from Atmore, AL (Zone 8b) wrote:

This tree is usually a small understory tree where I live. The leaves resemble water oak but are wider. The two are often confused. Blackjack oak is quite tolerant of shade and grows slowly. It seems to sporadically occur and never forms pure stands.

Neutral TREEHUGR On Dec 24, 2004, TREEHUGR from Now in Orlando, FL (Zone 9b) wrote:

Those are some great photos, Melody and Jeff.

The blackjack oak is another broad leafed deciduous oak that is native to Florida. It's found growing in with pines and other oaks in dry uplands and ridges. Also native to much of the east coast and Texas.

Spreading growth shape to 20-50 feet.

Positive melody On Jun 15, 2004, melody from Benton, KY (Zone 7a) wrote:

One of the wonderful Red Oaks, the Blackjack is denoted by the large fan like leaves. The pointed tufts show that it is in the Red Oak family.

Mature trees can get quite large and provide deep shade for outdoor recreation. They also provide acorns for the 'mast' in the Fall that birds, deer and small animals need to survive through the winter.

Here in West KY, we are blessed by a great many oak species, and a great number of them are in mixed forests. This Blackjack is in the City Park and it is surrounded by Southern Red Oaks, Post Oaks ,Eastern Black Oaks and Shingle Oaks. All of these are 'wild' trees that were there before the park was built.


This plant has been said to grow in the following regions:

Atmore, Alabama
Pelham, Alabama
Morrilton, Arkansas
Keystone Heights, Florida
Benton, Kentucky
Georgetown, Kentucky
Louisville, Kentucky
Weeksbury, Kentucky
Pasadena, Maryland
Perkinston, Mississippi
Rogersville, Missouri
Egg Harbor City, New Jersey
Lawnside, New Jersey
Neptune, New Jersey
Matthews, North Carolina
West End, North Carolina
Pauls Valley, Oklahoma
Tecumseh, Oklahoma
Christiana, Tennessee
Boerne, Texas

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